Abstract
A 1 formed directly from protonated di- and tripeptides most likely by concerted elimination of CO and an amino acid or smaller peptide. ions can be formed directly from protonated dipeptides in part through the sequential loss of A 2 although kinetic energy release measurements suggest direct elimination of HCOOH also may be H 2 O + CO, occurring. Internal immonium ions are shown to originate by further fragmentation of ions and by further A n fragmentation of ions. 1997 by John Wiley & Sons, Ltd. Y n / (
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